Precedent, Latest takes precedent, Latest – ETC Unison Mosaic Designer v1.11.0 User Manual
Page 96: Takes precedent plus (ltp+)

Unison Mosaic Designer User Manual
When setting times you can enter in this format directly (omitting leading zeros) or you can use h, m & s to spe-
cify your units and Designer will reformat accordingly. Furthermore, any number input without separators (h, m, s
or :) is taken literally if it is valid as such or converted if not, here a decimal point will always denote centiseconds.
For example:
00:01:30.00
1 minute and 30 seconds
(00:01:30.00)
1:30
1 minute and 30 seconds
(00:01:30.00)
90s
1 minute and 30 seconds
(00:01:30.00)
1h2.5m
1 hour, 2 minutes and 30 seconds
(01:02:30.00)
2h7m45.5s
2 hours, 7 minutes, 45 seconds and 50 centiseconds (half a second)
(02:07:45.50)
99
1 minute, 39 seconds ("99" not valid so converted)
(00:01:39.00)
100
1 minute,0 seconds ("100" valid so taken literally)
(00:01:00.00)
2020
20 minutes, 20 second
(00:20:20.00)
30.1
30 seconds and 10 centiseconds (tenth of a second)
(00:00:30.10)
Precedent
The Unison Mosaic Controllers use the Latest Takes Precedent Plus (LTP+) system (popularised by Flying Pig
Systems in the early 1990s) to determine what to output to a fixture (or, strictly speaking, fixture element or para-
meter) at playback runtime. LTP+ was an enhancement of the standard LTP system and was designed to incor-
porate automated lighting control. The "rules" of the LTP+ system are as follows:
1. After system initialisation, and prior to any preset (on a timeline) running, the output will be in a default,
"released" state. This does not mean that all DMX channels will be zero however as this default state is
determined by each fixture's library definition that will set parameters to sensible "home" positions, for
example pan and tilt to midway, irises and gobo/colour flags to open white.
2. The output will respond to the latest preset activated regardless of the preset data (so a preset pro-
grammed to black will override a colour).
3. When a preset expires or is explicitly released the output will revert to the prior state which may be an over-
ridden preset (if any) or the default state.
4. Fixture parameters are grouped by kind (Intensity, Colour, Beam Image, Beam Shape, Position & Control)
and so preset programming and thus precedent operates at this level - multiple presets can thus be
responsible for the output of a fixture with multiple parameter kinds e.g. a moving light or conventional fix-
ture with a scroller.
Since the Controllers can run multiple timelines simultaneously then some consideration should be given as to
how best structure the project. This is particularly important if the project calls for random triggering of timelines,
for example from a Button Panel Station (BPS), since there is no way of knowing in advance what state the out-
put will be in (i.e. which timelines have already been triggered) when a new timeline triggered. This interaction of
timelines can yield unexpected results unless care is taken when programming.
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